If
there's no mention about backdated payment on the order, I guess I won't be
able to claim it then?

Thanks.

It would seem
unlikely or at least not worth the expense and time to get clarification
from the court.

On a positive note it means your Court Order
will last longer. They can be overridden by an application to CMS after a
year which presumably won't be in your interests if you have agreed it via
the court.